| SUN WAY (O.A.) COMPANY LIMITED | Private company limited by shares | Live |
| CONCORD O.A. LIMITED | Private company limited by shares | Dissolved |
| POWER LONG (O.A.) COMPANY LIMITED | Private company limited by shares | Dissolved |
| OAAP Limited | Private company limited by shares | Live |
| O.A.C. ACCESSORIES LIMITED | Private company limited by shares | Live |
| OACC GROUP LIMITED | | Live |
| OAHA INTERNATIONAL PUBLICATION LIMITED | Private company limited by shares | Dissolved |
| OAHK COMPANY LIMITED | Private company limited by shares | Live |
| OAHU INVESTMENTS HOLDING LIMITED | Private company limited by shares | Dissolved |
| Oahy Ads Limited | | Live |
| O'AIM LIMITED | Private company limited by shares | Live |
| OAKA LIMITED | Private company limited by shares | Dissolved |
| OAKA LIMITED | Private company limited by shares | Live |
| Oakalea Group Limited | | Live |
| OAKBAR HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| OAKBELL COMPANY LIMITED | Private company limited by shares | Dissolved |
| OAKBRIDGE COMPANY LIMITED | Private company limited by shares | Dissolved |
| OAKBROOK HOLDING LIMITED | Private company limited by shares | Live |
| OAKBURY COMPANY LIMITED | Private company limited by shares | Dissolved |
| OAKBURY PRIMARY LIMITED | Private company limited by shares | Live |
| OAKCALL NETWORK LIMITED | Private company limited by shares | Live |
| Oakcoal & Turf Limited | | Live |
| Oakcrest Capital Limited | Private company limited by shares | Live |
| OAKDALE LIMITED | Private company limited by shares | Dissolved |
| OAKDALE INVESTMENTS LIMITED | Private company limited by shares | Live |
| OAKEN CO. LIMITED | Private company limited by shares | Dissolved |
| Oaken Company Limited | Private company limited by shares | Live |
| Oakenbridge Limited | Private company limited by shares | Live |
| OAKENFOLD LIMITED | Private company limited by shares | Live |
| OAKENSHIELD LIMITED | Private company limited by shares | Dissolved |
| OAKENSTONE LIMITED | Private company limited by shares | Dissolved |
| Oakenweller Limited | Private company limited by shares | Live |
| OAKENWOOD FINANCE LIMITED | Private company limited by shares | Dissolved |
| OAKERVEE PERRETT (ASIA) LIMITED | Private company limited by shares | Dissolved |
| Oakes Trade Limited | | Live |
| OAKEY LIMITED | Private company limited by shares | Live |
| OAKEY INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| Oakfair Limited | Private company limited by shares | Live |
| OAKFAME INVESTMENT LIMITED | Private company limited by shares | Live |
| OAKFIELD COMPANY LIMITED | Private company limited by shares | Dissolved |
| OAKFIELD LIMITED | Private company limited by shares | Dissolved |
| OAKFIELD LIMITED | Private company limited by shares | Dissolved |
| OAKFIELD LIMITED | Private company limited by shares | Live |
| OAKFIELD (ASIA) LIMITED | Private company limited by shares | Dissolved |
| OAKFIELD CAPITAL LIMITED | Private company limited by shares | Live |
| OAKFIELD INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| OAKFINE FASHION FACTORY LIMITED | Private company limited by shares | Dissolved |
| OAKFORD LIMITED | Private company limited by shares | Live Ceased dormancy on 29-Mar-2007 |
| Oakfront Global Limited | Private company limited by shares | Live |
| OakGarden HK Limited | Private company limited by shares | Live |
| OAKGM TRADE LIMITED | Private company limited by shares | Live |
| OAKGROVE INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| OAKGROVE OVERSEAS LIMITED | Private company limited by shares | Live |
| OAKHAM LIMITED | Private company limited by shares | Dissolved |
| Oakham Partners Limited | Private company limited by shares | Live |
| OAKHEATH INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| OAKHILL LIMITED | Private company limited by shares | Live |
| OAKHILL ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| OAKHILL HOME LIMITED | Private company limited by shares | Live |
| OAKHILL OF CALIFORNIA PROPERTIES (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| OAKHURST LIMITED | Private company limited by shares | Dissolved |
| OAKI DESIGN LIMITED | Private company limited by shares | Live |
| OAKIA INVESTMENTS (H.K.) LIMITED | Private company limited by shares | Live |
| OAKINGTON INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| OAKKNOLL PRODUCTS LIMITED | Private company limited by shares | Live |
| NEW OAKLAND COMPANY LIMITED | Private company limited by shares | Live |
| OAKLAND LIMITED | Private company limited by shares | Live |
| OAKLAND BILLIARDS ASSOCIATION LIMITED | Private company limited by shares | Dissolved |
| OAKLAND HOLDING LIMITED | Private company limited by shares | Live |
| "HONG KONG-USA" OF OAKLAND BUYERS ASSOCIATION LIMITED | Company limited by guarantee | Dissolved |
| OAKLAND INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| OAKLAND INVESTMENTS LIMITED | Private company limited by shares | Live |
| OAKLAND PACIFIC LIMITED | Private company limited by shares | Dissolved |
| Oakland Trading Company Limited | Private company limited by shares | Live |
| Oakleaf Enterprise Limited | | Live |
| Oakleaf Group Limited | Private company limited by shares | Live |
| Oakleaf Group Limited | | Live |
| OAKLEIGH LIMITED | Private company limited by shares | Dissolved |
| OAKLEIGH COMPANY LIMITED | Private company limited by shares | Dissolved |
| OAKLEIGH ASIA LIMITED | Private company limited by shares | Live |
| OAKLEIGH INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| OAKLEIGH MANAGEMENT LIMITED | Private company limited by shares | Dissolved |
| OAKLEIGH PARK LIMITED | Private company limited by shares | Live |
| OAKLEIGH PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| GOLDEN OAKLET CO., LIMITED | Private company limited by shares | Live |
| OAKLEY LIMITED | Private company limited by shares | Dissolved |
| OAKLEY LIMITED | Private company limited by shares | Dissolved |
| OAKLEY 09 LIMITED | | Live |
| Oakley Limited | | Live |
| OAKLEY PACIFIC LIMITED | Private company limited by shares | Dissolved |
| OAKLIGHT COMPANY LIMITED | Private company limited by shares | Live |
| OAKLINE LIMITED | Private company limited by shares | Live Ceased dormancy on 10-Aug-2000 |
| OAKLINE INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| OAKLINK LIMITED | Private company limited by shares | Live |
| OAKLORD LIMITED | Private company limited by shares | Dissolved |
| OAKMAN DEAN LIMITED | Private company limited by shares | Dissolved |
| OAKMAN(HK) LIMITED | Private company limited by shares | Live |
| OAKMARK LIMITED | Private company limited by shares | Live |
| OAKMONT DIAMOND LIMITED | Private company limited by shares | Live |
| OAKMONT ESTATES LIMITED | Private company limited by shares | Dissolved |